The following clinical manifestations of trigeminal neuralgia are not included.

The main manifestation of this disease is that a branch of trigeminal nerve suddenly appears lightning-like extremely severe pain. Pain can be spontaneous or caused by a slight stimulus "trigger point". Episodes usually occur in the daytime, and each episode usually lasts for several seconds, tens of seconds or 1 ~ 2 minutes and then stops suddenly. Sometimes there may be symptoms such as flushing in the pain area, congestion of the combined membrane, tears, sweating and salivation, and increased nasal mucus, which is called painful convulsion. The interval between two attacks is called intermission, and there are no pain symptoms.